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📄 jquery.ui.touch-punch.js(4.96 KB)

Editing: jquery.ui.touch-punch.js

/*!
 * jQuery UI Touch Punch 0.2.3
 *
 * Copyright 2011–2014, Dave Furfero
 * Dual licensed under the MIT or GPL Version 2 licenses.
 *
 * Depends:
 *  jquery.ui.widget.js
 *  jquery.ui.mouse.js
 */
(function ($) {

// Detect touch support
  $.support.touch = 'ontouchend' in document;

// Ignore browsers without touch support
  if (!$.support.touch) {
    return;
  }

var mouseProto = $.ui.mouse.prototype,
      _mouseInit = mouseProto._mouseInit,
      _mouseDestroy = mouseProto._mouseDestroy,
      touchHandled;

/**
   * Simulate a mouse event based on a corresponding touch event
   * @param {Object} event A touch event
   * @param {String} simulatedType The corresponding mouse event
   */
  function simulateMouseEvent (event, simulatedType) {

// Ignore multi-touch events
    if (event.originalEvent.touches.length > 1) {
      return;
    }

event.preventDefault();

var touch = event.originalEvent.changedTouches[0],
        simulatedEvent = document.createEvent('MouseEvents');
    
    // Initialize the simulated mouse event using the touch event's coordinates
    simulatedEvent.initMouseEvent(
      simulatedType,    // type
      true,             // bubbles                    
      true,             // cancelable                 
      window,           // view                       
      1,                // detail                     
      touch.screenX,    // screenX                    
      touch.screenY,    // screenY                    
      touch.clientX,    // clientX                    
      touch.clientY,    // clientY                    
      false,            // ctrlKey                    
      false,            // altKey                     
      false,            // shiftKey                   
      false,            // metaKey                    
      0,                // button                     
      null              // relatedTarget              
    );

// Dispatch the simulated event to the target element
    event.target.dispatchEvent(simulatedEvent);
  }

/**
   * Handle the jQuery UI widget's touchstart events
   * @param {Object} event The widget element's touchstart event
   */
  mouseProto._touchStart = function (event) {

var self = this;

// Ignore the event if another widget is already being handled
    if (touchHandled || !self._mouseCapture(event.originalEvent.changedTouches[0])) {
      return;
    }

// Set the flag to prevent other widgets from inheriting the touch event
    touchHandled = true;

// Track movement to determine if interaction was a click
    self._touchMoved = false;

// Simulate the mouseover event
    simulateMouseEvent(event, 'mouseover');

// Simulate the mousemove event
    simulateMouseEvent(event, 'mousemove');

// Simulate the mousedown event
    simulateMouseEvent(event, 'mousedown');
  };

/**
   * Handle the jQuery UI widget's touchmove events
   * @param {Object} event The document's touchmove event
   */
  mouseProto._touchMove = function (event) {

// Ignore event if not handled
    if (!touchHandled) {
      return;
    }

// Interaction was not a click
    this._touchMoved = true;

// Simulate the mousemove event
    simulateMouseEvent(event, 'mousemove');
  };

/**
   * Handle the jQuery UI widget's touchend events
   * @param {Object} event The document's touchend event
   */
  mouseProto._touchEnd = function (event) {

// Ignore event if not handled
    if (!touchHandled) {
      return;
    }

// Simulate the mouseup event
    simulateMouseEvent(event, 'mouseup');

// Simulate the mouseout event
    simulateMouseEvent(event, 'mouseout');

// If the touch interaction did not move, it should trigger a click
    if (!this._touchMoved) {

// Simulate the click event
      simulateMouseEvent(event, 'click');
    }

// Unset the flag to allow other widgets to inherit the touch event
    touchHandled = false;
  };

/**
   * A duck punch of the $.ui.mouse _mouseInit method to support touch events.
   * This method extends the widget with bound touch event handlers that
   * translate touch events to mouse events and pass them to the widget's
   * original mouse event handling methods.
   */
  mouseProto._mouseInit = function () {
    
    var self = this;

// Delegate the touch handlers to the widget's element
    self.element.bind({
      touchstart: $.proxy(self, '_touchStart'),
      touchmove: $.proxy(self, '_touchMove'),
      touchend: $.proxy(self, '_touchEnd')
    });

// Call the original $.ui.mouse init method
    _mouseInit.call(self);
  };

/**
   * Remove the touch event handlers
   */
  mouseProto._mouseDestroy = function () {
    
    var self = this;

// Delegate the touch handlers to the widget's element
    self.element.unbind({
      touchstart: $.proxy(self, '_touchStart'),
      touchmove: $.proxy(self, '_touchMove'),
      touchend: $.proxy(self, '_touchEnd')
    });

// Call the original $.ui.mouse destroy method
    _mouseDestroy.call(self);
  };

})(jQuery);

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